docs: add requirements section to README.md for React Native and platform compatibility

Author: floydkim

README.md

@@ -8,10 +8,16 @@
 
 ### 🚀 New Architecture support
 
-Supports React Native 0.74 ~ 0.80.
+Supports React Native 0.74 ~ 0.81.
 
 (Tested on the React Native CLI template apps)
 
+### ✅ Requirements
+
+- **React Native**: 0.74 or higher
+- **iOS**: 15.5 or higher
+- **Android**: API level 16 or higher
+
 ## 🚗 Migration Guide
 
 If you have been using `react-native-code-push`, replace the NPM package first.